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Mend Vaillant ecoTEC Ecotec Fault Code

fault code f20 f11?

what does this mean eco tec

adam
February 2009
VaillantVaillant ecoTECHeating, Home Heating SystemsVaillant Ecotec Fault Code
F.11 Return NTC short circuit.
Cause - NTC defective, cable/casing shortcut

F.20 Safety temperature limiter by NTC activated. Cause - Flow-NTC not correctly thermal-connected or defective; appliance does not shut down

Andy
February 2009

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